05 POLARIS SPORTS500H: Polaris Genuine Accessories Polaris Engineered Heavy Duty Drive Belt The drive belt represents one of the most critical performance links in your Polaris&#174; vehicle - the link between the engine and maximum performance. Polaris&#174; Belts are designed, engineered and tested by Polaris&#174; engineers and field test crews to ensure they deliver a perfect fit, maximum performance and ultimate durability. Nothing else comes close. Lowest tolerances available (0.188") means these belts have the least variation allowed in width and length, resulting in consistently higher performance. All belts undergo at least 20,000 miles of vehicle testing and 1,500 hours of runtime in a dynamometer.